C++ Primer notes: Chapter 2. Variables and Basic Types
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2.4. const Qualifier
const variables declared at global scope are local to the file in which the object is defined.
Nonconst variables are extern by default. To make a const variable accessible to other files we must explicitly specify that it is extern..
2.5. References:
A reference serves as an alternative name for an object. In real-world programs, references are primarily used as formal parameters to functions.
A const reference may be bound to an object of a different but related type or to an rvalue.
2.6. Typedef Names
Typedefs are commonly used for one of three purposes:
-
To hide the implementation of a given type and emphasize instead the purpose for which the type is used
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To streamline complex type definitions, making them easier to understand
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To allow a single type to be used for more than one purpose while making the purpose clear each time the type is used
2.7. Enumerations
An enumeration is defined using the enum keyword, followed by an optional enumeration name, and a comma-separated list of enumerators enclosed in braces.
An object of enumeration type may be initialized or assigned only by one of its enumerators or by another object of the same enumeration type
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